Business Segment Information - People's Republic of China Including Hong Kong Percentage Share of the Company's Total Revenue, Net Revenue, Total Identifiable Assets or Equity (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total revenues | People's Republic of China, including Hong Kong
Concentration Risk [Line Items]
Concentration percentage	33.00%	34.00%	34.00%
Net revenues | People's Republic of China, including Hong Kong
Concentration Risk [Line Items]
Concentration percentage	16.00%	16.00%	18.00%
Identifiable assets at year end | People's Republic of China, including Hong Kong
Concentration Risk [Line Items]
Concentration percentage	14.00%	17.00%	14.00%
Equity | People's Republic of China, including Hong Kong
Concentration Risk [Line Items]
Concentration percentage	11.00%	16.00%	13.00%
Lower end | Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration percentage	10.00%	10.00%	10.00%